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Cell division demands lot of resources in the form of energy. Therefore, it is easy to have ... We must understand the origin and evolution of stem cells to understand at what junction during the course of evolution, a need for stem cells arose. Until then it might be ...

The answer I found is that plant cell walls are not permeable to big proteins (more than 30-60 kDa), so they must be ... walls for protein transportation. So an animal cell necessarily doesn't have gap junction. But I'm not sure. Is it right? Any idea would be appreciated.

... transcription PCR). The protocol I have in mind is to transfect my cells with my desired proteins and when I split my cell lysate I will keep ... within an exon and also that you want the primers to be at an exon-exon junction because that would eliminate genomic DNA contamination. Which one ...

... idea with the nerve pulse and Ach release into the neuromuscular junction... Once the Ach binds to its nicotinic receptor, it opens ligand gated channels for Na+ diffusion into muscular cell. This gives it enough "voltage" to reach its threshold which initiates ...